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United States Patent | 5,682,023 |
McHugh ,   et al. | October 28, 1997 |
A linear motor for operating an elevator door is energized using a bang-bang control strategy (10) wherein three-phase AC utility mains (16) are connected (29) directly to the linear motor primary (14) by means of a motor control (12) in response to control signals (26) provided under the direction of a control strategy (10), which may be microprocessor-based. Commands (24) from an elevator controller to open/close the elevator door cause the system to operate the doors and a sensor (22) provides feedback (28) by means of which the control (10) is able to determine switch points for switching the AC mains.
Inventors: | McHugh; Thomas M. (Farmington, CT); Peruggi; Richard E. (Glastonbury, CT); Ahigian; Edward E. (Arlington Heights, IL); Jaminet; Jerome F. (South Windsor, CT); He; Thomas (Unionville, CT); Kowalczyk; Thomas M. (Farmington, CT); Kulak; Richard E. (Bristol, CT); Barrett; David W. (East Hartford, CT) |
Assignee: | Otis Elevator Company (Farmington, CT) |
Appl. No.: | 533594 |
Filed: | September 25, 1995 |
Current U.S. Class: | 187/316; 49/103; 187/295 |
Intern'l Class: | B66B 013/14 |
Field of Search: | 187/316,317,293 49/103 |
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Foreign Patent Documents | |||
3264486 | Nov., 1991 | JP. | |
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1148444 | Apr., 1969 | GB. |
"Linear direct drives featuring three-phase asynchronous motors", a brochure from Automation & Servo Technologies, Inc. a U.S. representative of Krauss Maffei AG. |